28402313 has 2 divisors, whose sum is σ = 28402314. Its totient is φ = 28402312.

The previous prime is 28402307. The next prime is 28402331. The reversal of 28402313 is 31320482.

Together with next prime (28402331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27426169 + 976144 = 5237^2 + 988^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28402313 is a prime.

It is not a weakly prime, because it can be changed into another prime (28402373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14201156 + 14201157.

It is an arithmetic number, because the mean of its divisors is an integer number (14201157).

Almost surely, 2^28402313 is an apocalyptic number.

It is an amenable number.

28402313 is a deficient number, since it is larger than the sum of its proper divisors (1).

28402313 is an equidigital number, since it uses as much as digits as its factorization.

28402313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 28402313 is about 5329.3820467292. The cubic root of 28402313 is about 305.1063429230.

Adding to 28402313 its reverse (31320482), we get a palindrome (59722795).

The spelling of 28402313 in words is "twenty-eight million, four hundred two thousand, three hundred thirteen".